Inheritance: RDomBaseExpression, ILambdaSingleExpression
 internal RDomLambdaSingleExpression(RDomLambdaSingleExpression oldRDom)
     : base(oldRDom)
 {
     _parameters = oldRDom.Parameters.Copy(this);
 }
 internal RDomLambdaSingleExpression(RDomLambdaSingleExpression oldRDom)
     : base(oldRDom)
 {
     _parameters = oldRDom.Parameters.Copy(this);
 }